盾构隧道下穿既有铁路桥梁桩基的加固措施
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摘要
依托武汉地铁3号线盾构隧道下穿既有铁路桥梁桩基工程,分别对不加固、桩基周围土体注浆加固、采取隔离桩防护3种工况隧道下穿过程进行有限元数值模拟。结果表明:2种加固措施均能减少地表沉降和桩基位移,满足既有结构物变形控制要求;与注浆加固相比,隔离桩防护对地层沉降和桩基位移的控制效果更显著。在此前提下,可综合考虑工程量、工程造价等因素,根据工程实际情况合理选用加固措施。
Based on the bridge pile foundation project of existing railway under-crossed by the shield tunnel of W uhan metro line No. 3,the finite element numerical simulation of tunnel under-crossing process in such three conditions as non-reinforcement,grouting reinforcement of soil around pile foundation and isolation pile protection were carried out respectively.The results show that both reinforcement measures can reduce ground settlement and pile foundation displacement,which could meet the deformation control requirements of existing structures,the control effect of isolation pile protection on ground settlement and pile foundation displacement is more significant by comparing with grouting reinforcement. On this premise,the factors such as engineering quantity,engineering cost and so on can be considered comprehensively,and the reinforcement measures can be selected reasonably according to the actual situation of the project.
Based on the bridge pile foundation project of existing railway under-crossed by the shield tunnel of W uhan metro line No. 3,the finite element numerical simulation of tunnel under-crossing process in such three conditions as non-reinforcement,grouting reinforcement of soil around pile foundation and isolation pile protection were carried out respectively.The results show that both reinforcement measures can reduce ground settlement and pile foundation displacement,which could meet the deformation control requirements of existing structures,the control effect of isolation pile protection on ground settlement and pile foundation displacement is more significant by comparing with grouting reinforcement. On this premise,the factors such as engineering quantity,engineering cost and so on can be considered comprehensively,and the reinforcement measures can be selected reasonably according to the actual situation of the project.
引文
[1]孙雪兵.盾构隧道下穿施工对邻近铁路桥梁的影响分析[J].铁道建筑,2018,58(4):73-77.
[2]周正宇,苏洁.地铁施工对邻近既有桥梁主动防护技术的研究[J].都市快轨交通,2012,25(3):68-71.
[3]夏炜洋,何川,葛蔚敏,等.成都地铁一号线盾构机下穿万福桥数值模拟分析[J].铁道建筑,2009,49(4):46-48.
[4]郑熹光.盾构隧道施工对邻近桩基础位移和受力特性的影响研究[D].北京:北京交通大学,2015..
[5]刘可玉.富水砂层盾构下穿浅基础桥梁变形规律与控制技术[J].施工技术,2015,44(增2):356-360.
[6]胡雄玉.不同加固方式下盾构施工对桥梁桩基影响的研究[J].铁道建筑,2013,53(3):75-77.
[7]李波.地铁盾构施工与隔离桩施工对既有桥梁桩基影响的对比分析[J].中国水运,2014,14(3):275-277.
[8]王长宁,韩高孝.深埋盾构隧道在岩层中穿越桥梁时隔离桩适用性研究[J].石家庄铁道大学学报(自然科学版),2015,28(2):45-49,67.
[9]彭坤,陶连金,高玉春,等.盾构隧道下穿桥梁引起桩基变位的数值分析[J].地下空间与工程学报,2012,8(3):485-489.
[10]张新.砂卵石地层盾构隧道下穿铁路桥梁加固方案比选[J].铁道建筑技术,2014(10):32-35,96.
[2]周正宇,苏洁.地铁施工对邻近既有桥梁主动防护技术的研究[J].都市快轨交通,2012,25(3):68-71.
[3]夏炜洋,何川,葛蔚敏,等.成都地铁一号线盾构机下穿万福桥数值模拟分析[J].铁道建筑,2009,49(4):46-48.
[4]郑熹光.盾构隧道施工对邻近桩基础位移和受力特性的影响研究[D].北京:北京交通大学,2015..
[5]刘可玉.富水砂层盾构下穿浅基础桥梁变形规律与控制技术[J].施工技术,2015,44(增2):356-360.
[6]胡雄玉.不同加固方式下盾构施工对桥梁桩基影响的研究[J].铁道建筑,2013,53(3):75-77.
[7]李波.地铁盾构施工与隔离桩施工对既有桥梁桩基影响的对比分析[J].中国水运,2014,14(3):275-277.
[8]王长宁,韩高孝.深埋盾构隧道在岩层中穿越桥梁时隔离桩适用性研究[J].石家庄铁道大学学报(自然科学版),2015,28(2):45-49,67.
[9]彭坤,陶连金,高玉春,等.盾构隧道下穿桥梁引起桩基变位的数值分析[J].地下空间与工程学报,2012,8(3):485-489.
[10]张新.砂卵石地层盾构隧道下穿铁路桥梁加固方案比选[J].铁道建筑技术,2014(10):32-35,96.